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Commitments and Contingencies (Narrative) (Detail) $ in Thousands, T in Millions |  | 3 Months Ended | 12 Months Ended | 150 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 19, 2017 T | Mar. 31, 2017 a ft T | Dec. 31, 2016 T | Mar. 31, 2017 a ft | Dec. 02, 2014 USD ($)
Contingencies And Commitments [Line Items] |  |  |  |  |
Estimated clean up costs | $ |  |  |  |  | $ 342,000
Chiquita Canyon, LLC [Member] |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |
Annual tons of waste accepted at landfill |  |  | 3 |  |
Existing waste footprint of landfill | a |  | 257 |  | 257 |
Requested footprint in landfill expansion application | a |  | 400 |  | 400 |
Existing maximum elevation of landfill | ft |  | 1,430 |  | 1,430 |
Requested maximum elevation in landfill expansion application | ft |  | 1,573 |  | 1,573 |
Duration of permitting and environmental impact review for conditional use permit to authorize continued operation and expansion of landfill |  |  |  | 12 years 6 months |
Recommended condition for approval of conditional use permit, increase in taxes and fees percentage |  | 587.00% |  |  |
Environmental Remediation Expense [Member] |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |
Estimated period to implement cleanup remedy |  | 7 years |  |  |
Required period of monitoring following the clean-up |  | 10 years |  |  |
Maximum [Member] | Chiquita Canyon, LLC [Member] |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |
Recommended condition for approval of conditional use permit, annual limit on tonnage the landfill can accept |  | 2 |  |  |
Current annual limit of overall tonnage at landfill |  | 3 |  |  |
Subsequent Event [Member] | Chiquita Canyon, LLC [Member] |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |
Date application for expansion of landfill and extension of conditional use permit was accepted | Apr. 19, 2017 |  |  |  |
Duration of extension of conditional use permit extension | 30 years |  |  |  |
Subsequent Event [Member] | Minimum [Member] | Chiquita Canyon, LLC [Member] |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |
Company requested increase in fees paid for approval of conditional use permit | 50.00% |  |  |  |
Subsequent Event [Member] | Maximum [Member] | Chiquita Canyon, LLC [Member] |  |  |  |  |
Contingencies And Commitments [Line Items] |  |  |  |  |
Company requested increase in fees paid for approval of conditional use permit | 100.00% |  |  |  |
Company requested annual limit on tonnage the landfill can accept | 3 |  |  |  |

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